﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using Microsoft.Phone.Net.NetworkInformation;
using WeatherCN_Phone.WeatherCNData;

namespace WeatherCN_Phone
{
    public partial class App : Application
    {
        private static MainViewModel viewModel = null;
        public static MainViewModel ViewModel
        {
            get
            {
                // Delay creation of the view model until necessary
                if (viewModel == null)
                    viewModel = App.Current.Resources["ResMainVM"] as MainViewModel;

                return viewModel;
            }
        }

        public PhoneApplicationFrame RootFrame { get; private set; }

        // Code to execute when the application is activated (brought to foreground)
        // This code will not execute when the application is first launched
        private void Application_Activated(object sender, ActivatedEventArgs e)
        {
            App.ViewModel.LoadData();

            App.ViewModel.selectIndex =(int) PhoneApplicationService.Current.State["CurrentPanoramaItemIndex"];
            App.viewModel.WeatherInfo = PhoneApplicationService.Current.State["CurrentCityInfo"] as WeatherInfo_Converted;

            PhoneApplicationService.Current.State.Remove("CurrentPanoramaItemIndex");
            PhoneApplicationService.Current.State.Remove("CurrentCityInfo");
        }

        #region Phone application initialization

        // Avoid double-initialization
        private bool phoneApplicationInitialized = false;

        // Do not add any additional code to this method
        private void InitializePhoneApplication()
        {
            if (phoneApplicationInitialized)
                return;

            // Create the frame but don't set it as RootVisual yet; this allows the splash
            // screen to remain active until the application is ready to render.
            RootFrame = new PhoneApplicationFrame();
            RootFrame.Navigated += CompleteInitializePhoneApplication;

            // Handle navigation failures
            RootFrame.NavigationFailed += RootFrame_NavigationFailed;

            // Ensure we don't initialize again
            phoneApplicationInitialized = true;
        }

        // Do not add any additional code to this method
        private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
        {
            // Set the root visual to allow the application to render
            if (RootVisual != RootFrame)
                RootVisual = RootFrame;

            // Remove this handler since it is no longer needed
            RootFrame.Navigated -= CompleteInitializePhoneApplication;
        }

        #endregion

        public App()
        {
            // Global handler for uncaught exceptions. 
            UnhandledException += Application_UnhandledException;

            // Show graphics profiling information while debugging.
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // Display the current frame rate counters.
                Application.Current.Host.Settings.EnableFrameRateCounter = true;

                // Show the areas of the app that are being redrawn in each frame.
                //Application.Current.Host.Settings.EnableRedrawRegions = true;

                // Enable non-production analysis visualization mode, 
                // which shows areas of a page that are being GPU accelerated with a colored overlay.
                //Application.Current.Host.Settings.EnableCacheVisualization = true;
            }

            // Standard Silverlight initialization
            InitializeComponent();

            // Phone-specific initialization
            InitializePhoneApplication();
        }

        // Code to execute when the application is launching (eg, from Start)
        // This code will not execute when the application is reactivated
        private void Application_Launching(object sender, LaunchingEventArgs e)
        {
            //如果网络不可用则提示用户并退出
            if (NetworkInterface.GetIsNetworkAvailable())
            {
                if (!App.ViewModel.IsDataLoaded)
                {
                    App.ViewModel.LoadData();
                }
            }
            else
            {
                MessageBox.Show("This application needs Network connections,WeatherCN can't access the network and will be Exit.");
                App.Quit();
            }
        }
        private class QuitException : Exception { }
        public static void Quit()
        {
            throw new QuitException();
        }




        // Code to execute when the application is deactivated (sent to background)
        // This code will not execute when the application is closing
        private void Application_Deactivated(object sender, DeactivatedEventArgs e)
        {
            PhoneApplicationService.Current.State.Add("CurrentPanoramaItemIndex", App.ViewModel.CurrentPanoramaItemSelectIndex);
            if (App.ViewModel.WeatherInfo.cityid != null)
            {
                PhoneApplicationService.Current.State.Add("CurrentCityInfo", App.ViewModel.WeatherInfo);
            }
        }

        // Code to execute when the application is closing (eg, user hit Back)
        // This code will not execute when the application is deactivated
        private void Application_Closing(object sender, ClosingEventArgs e)
        {
        }

        // Code to execute if a navigation fails
        private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // A navigation has failed; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        // Code to execute on Unhandled Exceptions
        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            if (e.ExceptionObject is QuitException)
                return;

            if (System.Diagnostics.Debugger.IsAttached)
            {
                // An unhandled exception has occurred; break into the debugger
                System.Diagnostics.Debugger.Break();
            }

            //为了通过Marketplace，此处无奈
            //MessageBox.Show("Error Occurred,WeatherCN needs to be Closed.");
            App.ViewModel.GetSpecificWeatherInfoCommand.Execute("101010100");
            e.Handled = true;
        }

    }
}